Advice Needed - Canadian in US during launch

Hi Everyone,
I'll be travelling through the US during launch day - buffalo at about launch time, and then proceeding south for the week. When I ordered my last iPad, it was delivered right to my door on Canadian Launch day, so I've never had to endure the lineups or think about product constraints for in-store purchase.

I will buy while I'm there, preferably on Launch Day. In your experiences, how long can I expect to wait if I arrive at the Apple Store a few hours after launch? What other US Stores will have it? And if Best Buy has product, how quickly are they gone?

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